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Pré-Publication, Document De Travail Année : 2020

Complementarity of impact shot displacements and induced residual stress fields for a reliable estimation of crystal viscoplasticity parameters

Résumé

This work investigates the possibility to identify two crystal plasticity viscoplastic parameters K and n using two different outputs produced by the high velocity impact of a sphere onto a metallic sample: the shot displacement and the different components of the induced residual stress field on a cross-section under the dent. The identifiability of the two parameters using either the shot displacement, the residual stress field or the combination of both outputs is investigated using the sensitivity of each field to a variation of the coefficients as well as an identifiability indicator, I, representative of the problem well posedness. This work demonstrates that identification of K and n using only the displacement curve is an ill-posed problem, even when combining the displacements obtained with different impact conditions. The residual stress field under the dent is proved to be rich enough to obtain the two coefficients using any of the in-plane stress components. Combining two stress components for identification results only in a slightly better conditioning of the problem. Finally, combining the shot displacement curve with a single component of the residual stress field obtained for the same test greatly improves the value of I. This result demonstrates that those two outputs provide complementary information for identification of the two coefficients.
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hal-03019130 , version 1 (23-11-2020)

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  • HAL Id : hal-03019130 , version 1

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S. Breumier, Fabrice Richard, Claire Maurice, Aurélien Villani, Guillaume Kermouche, et al.. Complementarity of impact shot displacements and induced residual stress fields for a reliable estimation of crystal viscoplasticity parameters. 2020. ⟨hal-03019130⟩
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